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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* chresampler.cc
*
* Tue Sep 23 20:42:14 CEST 2014
* Copyright 2014 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* DrumGizmo is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "chresampler.h"
#include "cpp11fix.h"
#include <config.h>
#include <hugin.hpp>
#include <stdio.h>
#ifdef WITH_RESAMPLER
#if defined(USE_ZITA)
#include <zita-resampler/resampler.h>
#elif defined(USE_SRC)
#include <samplerate.h>
#else
#error "No resampler selected"
#endif
class CHResampler::Prv
{
public:
#if defined(USE_ZITA)
Resampler zita;
#elif defined(USE_SRC)
SRC_STATE* state;
SRC_DATA data;
#endif
};
CHResampler::CHResampler()
: prv{std::make_unique<Prv>()}
{
#if defined(SRC)
prv->state = nullptr;
#endif
}
void CHResampler::setup(double input_fs, double output_fs)
{
if((input_fs == 0.0) || (output_fs == 0.0))
{
return;
}
int nchan = 1; // always mono
this->input_fs = input_fs;
this->output_fs = output_fs;
#if defined(USE_ZITA)
DEBUG(resampler, "Using zita-resampler (%d -> %d)", (int)input_fs,
(int)output_fs);
// delay is 2 * hlen, 72 corresponds to delay introduced by SRC.
int hlen = 72; // 16 ≤ hlen ≤ 96
prv->zita.reset();
prv->zita.setup(input_fs, output_fs, nchan, hlen);
std::size_t null_size = prv->zita.inpsize() / 2 - 1;
prv->zita.inp_data = nullptr;
prv->zita.inp_count = null_size;
prv->zita.out_data = nullptr;
prv->zita.out_count = 1024 * 1024;
prv->zita.process();
#elif defined(USE_SRC)
DEBUG(resampler, "Using libsamplerate (%d -> %d)", (int)input_fs,
(int)output_fs);
int err;
prv->state = src_new(SRC_SINC_BEST_QUALITY, nchan, &err);
(void)err;
// printf("err: %d\n", err);
src_set_ratio(prv->state, output_fs / input_fs);
prv->data.src_ratio = output_fs / input_fs;
prv->data.end_of_input = 0;
#endif
}
CHResampler::~CHResampler()
{
#if defined(USE_ZITA)
#elif defined(USE_SRC)
if(prv->state)
{
src_delete(prv->state);
}
#endif
}
void CHResampler::setInputSamples(float* samples, std::size_t count)
{
#if defined(USE_ZITA)
prv->zita.inp_data = samples;
prv->zita.inp_count = count;
#elif defined(USE_SRC)
prv->data.data_in = samples;
prv->data.input_frames = count;
#endif
}
void CHResampler::setOutputSamples(float* samples, std::size_t count)
{
#if defined(USE_ZITA)
prv->zita.out_data = samples;
prv->zita.out_count = count;
#elif defined(USE_SRC)
prv->data.data_out = samples;
prv->data.output_frames = count;
#endif
}
void CHResampler::process()
{
#if defined(USE_ZITA)
prv->zita.process();
#elif defined(USE_SRC)
src_process(prv->state, &prv->data);
prv->data.output_frames -= prv->data.output_frames_gen;
prv->data.data_out += prv->data.output_frames_gen;
prv->data.input_frames -= prv->data.input_frames_used;
prv->data.data_in += prv->data.input_frames_used;
#endif
}
std::size_t CHResampler::getLatency() const
{
if (input_fs == output_fs)
{
return 0;
}
#if defined(USE_ZITA)
return 0;
#elif defined(USE_SRC)
return 0; // TODO?
#endif
}
std::size_t CHResampler::getInputSampleCount() const
{
#if defined(USE_ZITA)
return prv->zita.inp_count;
#elif defined(USE_SRC)
return prv->data.input_frames;
#endif
}
std::size_t CHResampler::getOutputSampleCount() const
{
#if defined(USE_ZITA)
return prv->zita.out_count;
#elif defined(USE_SRC)
return prv->data.output_frames;
#endif
}
double CHResampler::getRatio() const
{
return input_fs / output_fs;
}
#else
// Dummy implementation
CHResampler::CHResampler() {}
CHResampler::~CHResampler() {}
void CHResampler::setup(double, double) {}
void CHResampler::setInputSamples(float*, std::size_t) {}
void CHResampler::setOutputSamples(float*, std::size_t) {}
void CHResampler::process() {}
std::size_t CHResampler::getLatency() const
{
return 0;
}
std::size_t CHResampler::getInputSampleCount() const
{
return 0;
}
std::size_t CHResampler::getOutputSampleCount() const
{
return 0;
}
double CHResampler::getRatio() const
{
return 1;
}
#endif /*WITH_RESAMPLER*/
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